Two options, one free day
For each city we took the two day trips travellers hesitate between the most and put the sheets side by side. Each comparison ends with a pick.

Versailles or Giverny?
Versailles, unless you have already seen it.

Reims or Rouen?
Reims if you booked a cellar, otherwise Rouen.

Oxford or Cambridge?
Oxford, unless you want the river.

Bath or York?
Bath for one day, York for two.

Florence or Pompeii?
Florence, unless it is already on your route.

Orvieto or Assisi?
Orvieto, unless you came for Saint Francis.

Montserrat or Girona?
Montserrat, unless the mountain is in cloud.

Sitges or Penedès?
Sitges, unless you came for cava.

Siena or Pisa?
Siena, unless the tower is the point.

Venice or Cinque Terre?
Venice: direct train, more hours there.

Zaanse Schans or Volendam and Marken?
Zaanse Schans, if you only have a morning.

Utrecht or Haarlem?
Utrecht for a full day, Haarlem for a morning.

Cliffs of Moher or Giant's Causeway?
Cliffs of Moher, unless you want Belfast too.

Howth or Malahide Castle?
Howth if it is dry, Malahide if not.

Sintra or Cascais?
Sintra, unless you only want the sea.

Évora or Tomar?
Évora first; Tomar for one great monument.

Toledo or Segovia?
Toledo first, unless it is Sunday.

Córdoba or Valencia?
Córdoba for one day, Valencia for two.

Kutná Hora or Český Krumlov?
Kutná Hora, unless you can stay a night.

Karlštejn Castle or Konopiště Castle?
Karlštejn is the easier half-day castle.

Delphi or Meteora?
Delphi. Meteora deserves a night.

Aegina or Hydra?
Aegina for the price, Hydra for the walk.

Loch Ness and the Highlands or Stirling Castle?
Stirling, unless the Highlands are the point.

St Andrews or North Berwick?
St Andrews for a day, North Berwick for half.